The initialization of discordRPC on iOS and Android was leading to a grey screen (UnimplementedError), preventing the app to paint the Flutter UI.
The flutter_discord_rpc is only available on macOS, Linux and Windows.
https://docs.flutter.dev/release/breaking-changes/flutter-generate-i10n-source
The flutter tool will no longer generate a synthetic package:flutter_gen or modify the package_config.json of the app.
Applications or tools that referenced package:flutter_gen should instead reference source files generated into the app's source directory directly.